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In which of the following pairs of complexes the central metal/ions do have same effective atomic number?

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$[Cr (CO)_{6}]$ and $[Fe (CO)_{5}]$

${[V (CO)_{6}]}^{-}$ and ${[Co {({NO}_{2})}_{6}]}^{3 -}$

${[Co {({NH}_{3})}_{6}]}^{2 +}$ and ${[Ni {({NH}_{3})}_{6}]}^{2 +}$

${[Cu ({CN}_{4})]}^{3 -}$ and $[Ni (CO)_{4}]$

answer is A, C, D.

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Detailed Solution

EAN in the given complexes can be calculated as,

EAN of $Cr = 24 + 12 = 36$ and EAN of $F e = 26 + 10 = 36$

EAN of ${Co}^{3 +} = 256 + 12 = 37$ and EAN of ${Ni}^{2 +} = 26 + 12 = 38$

EAN of ${Cu}^{+} = 28 + 12 = 36$ and EAN of $Ni = 28 + 8 = 36$

EAN of $V^{-} = 24 + 12 = 36$ and EAN of ${Co}^{3 +} = 24 + 12 = 36$

Hence correct option is (a, c, d).

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